78 results about "Hydration status" patented technology

Support structures for positioning sensors on a physiologic tunnel for measuring physical, chemical and biological parameters of the body and to produce an action according to the measured value of the parameters. The support structure includes a sensor fitted on the support structures using a special geometry for acquiring continuous and undisturbed data on the physiology of the body. Signals are transmitted to a remote station by wireless transmission such as by electromagnetic waves, radio waves, infrared, sound and the like or by being reported locally by audio or visual transmission. The physical and chemical parameters include brain function, metabolic function, hydrodynamic function, hydration status, levels of chemical compounds in the blood, and the like. The support structure includes patches, clips, eyeglasses, head mounted gear and the like, containing passive or active sensors positioned at the end of the tunnel with sensing systems positioned on and accessing a physiologic tunnel.

Support structures for positioning sensors on a physiologic tunnel for measuring physical, chemical and biological parameters of the body and to produce an action according to the measured value of the parameters. The support structure includes a sensor fitted on the support structures using a special geometry for acquiring continuous and undisturbed data on the physiology of the body. Signals are transmitted to a remote station by wireless transmission such as by electromagnetic waves, radio waves, infrared, sound and the like or by being reported locally by audio or visual transmission. The physical and chemical parameters include brain function, metabolic function, hydrodynamic function, hydration status, levels of chemical compounds in the blood, and the like. The support structure includes patches, clips, eyeglasses, head mounted gear and the like, containing passive or active sensors positioned at the end of the tunnel with sensing systems positioned on and accessing a physiologic tunnel.

Support structures for positioning sensors on a physiologic tunnel for measuring physical, chemical and biological parameters of the body and to produce an action according to the measured value of the parameters. The support structure includes a sensor fitted on the support structures using a special geometry for acquiring continuous and undisturbed data on the physiology of the body. Signals are transmitted to a remote station by wireless transmission such as by electromagnetic waves, radio waves, infrared, sound and the like or by being reported locally by audio or visual transmission. The physical and chemical parameters include brain function, metabolic function, hydrodynamic function, hydration status, levels of chemical compounds in the blood, and the like. The support structure includes patches, clips, eyeglasses, head mounted gear and the like, containing passive or active sensors positioned at the end of the tunnel with sensing systems positioned on and accessing a physiologic tunnel.

An irrigation modeling framework in precision agriculture utilizes a combination of weather data, crop data, and other agricultural inputs to create customized agronomic models for diagnosing and predicting a moisture state in a field, and a corresponding need for, and timing of, irrigation activities. Specific combinations of various agricultural inputs can be applied, together with weather information to identify or adjust water-related characteristics of crops and soils, to model optimal irrigation activities and provide advisories, recommendations, and scheduling guidance for targeted application of artificial precipitation to address specific moisture conditions in a soil system of a field.

A method of determining an indication of the hydration status relating to a subject. The method includes determining a measured impedance value for at least one body segment, and then; for each body segment, using the measured impedance values to determine at least one indicator at least partially indicative of a level of extracellular fluid. Indicators can then be used to determine an indication of the hydration status.

Dry cross-linked gelatin compositions are prepared that rapidly re-hydrate to produce gelatin hydrogels suitable as hemostatic sealants. Gelatin is cross-linked in the presence of certain re-hydration aids, such as polyethylene glycol, polyvinylprovidone, and dextran, in order to produce a dry cross-linked gelatin powder. The use of the re-hydration aids has been found to substantially increase the re-hydration rate in the presence of an aqueous re-hydration medium, typically thrombin-containing saline.

A gel mixing system that employs a dynamic diffuser for quickly removing the air from the fluid as the fluid exits a traditional gel mixer and employs progressive dilution of the gel in a series of hydration tanks to maximize hydration time without allowing the gel to become so viscous that it is not easily diluted or pumped. High shear agitation of the fluid between the hydration tanks helps to increase the hydration rate. Progressive dilution of the gel increases residence time of the gel in the tanks and results in longer hydration time in the limited tank space available, resulting in continuous production of gel that is almost fully hydrated when it is pumped to the fracturing blender and subsequently to the well bore without the need for an increase in the volume of the hydration tanks.

The invention discloses a hydration heat inhibited concrete expanding material as well as a preparation method and applications thereof. The hydration heat inhibited concrete expanding material is implemented by complexly using first two or three of an expanding agent, a hydration heat inhibitor and an inner curing agent. The hydration heat inhibited concrete expanding material disclosed by the invention fully plays the superimposed effect of the three types of materials, so that the dry shrinkage resistance and cold shrinkage resistance of concrete can be maximized. Experiments prove that concrete with the hydration heat inhibited concrete expanding material disclosed by the invention produces a large expansion in the temperature-fall period, thereby considerably improving the temperature shrinkage (caused by hydration heat) resistance of the concrete; the temperature rise of concrete can be effectively reduced; high relative humidity can be kept in the concrete for a long time, thereby providing a good hydration reaction environment for the expanding agent, and reducing dry shrinkage.

A device and method are provided for determining the volume ECVhydr(t) of a body compartment of a patient at a time t by conducting measurements at the time t of the patient to determine at least one anthropometric measure X(t), the extracellular water volume ECV(t), and the intracellular water volume ICV (t) of the patient. The extracellular water volume ECVbasic(t) of a first compartment with weight Wbasic(t) of the patient at the time t is derived by using X (t), the extracellular water volume ECVsec(t) of a second compartment of the patient at the time t is derived by using ICV (t), and ECVhydr(t) as the extracellular water volume of a third compartment of the patient is derived with weight Whydr(t). The extracellular volume ECVhydr(t) is a measure for the hydration status of the patient.

A device and method for determining the hydration and water content status of soft biological tissue is disclosed and includes a couple of ultrasonic transducers located at a known distance therebetween and held against the tissue of interest as well as an adjustable support system with angle measuring means necessary for evaluation of ultrasound velocity in this tissue. Based on the time-of-flight results of the ultrasound velocity measurement, the water content in the tested tissue is evaluated and the hydration status is determined. One embodiment of the invention is a wearable device attached to human calf measuring water content in muscle.

A system for determining the hydration status of an individual utilizes a light sources and a photodetectors to extract a plethysmographic waveform from an individual and applies feature extraction to extract features from said plethysmographic waveform from which the hydration status of the individual can be inferred or calculated. The system of preferably housed in a wearable housing.

The present invention is to provide a polymer electrolyte material realizing excellent proton conductivity even when it comes into direct contact with liquid fuel at high temperature and high concentration, and excellent fuel barrier property and mechanical strength, as well as to provide a polymer electrolyte fuel cell of high efficiency. A polymer electrolyte material of the present invention is characterized in that fraction Rw of non-freezing water shown by the equation (S1) below is 75 to 100% by weight, and an ionic group is included, in a moisture state taken out after 12-hour immersion in 1 to 30% by weight methanol aqueous solution at 40 to 80° C. and then 24-hour immersion in pure water at 20°: Rw=[Wnf / (Wfc+Wnf)]×100  (S1) (wherein, Wnf represents an amount of non-freezing water per 1 g of dry weight of polymer electrolyte material, Wfc represents an amount of lower-melting point water per 1 g of dry weight of polymer electrolyte material). A polymer electrolyte part of the present invention is characterized by being made from such a polymer electrolyte material, a membrane electrode assembly of the present invention is characterized by being made from such a polymer electrolyte part, and a polymer electrolyte fuel cell of the present invention is formed by using by being made from such a membrane electrode assembly.

An improved sensor (102) for physiology monitoring in mobile devices, wearables, security, illumination, photography, and other devices and systems uses broadband light (114) transmitted to a target (125) such as the ear, face, or wrist of a living subject. Some of the scattered light returning from the target to detector (141) is passed through narrowband spectral filter set (155) to produce multiple detector regions, each sensitive to a different wavelength range. Data from the detected light is spectrally analyzed to computationally partition the analyzed data into more than one compartment of different temporal or physiological characteristics (such as arterial bloodstream, venous bloodstream, skin surface, and tissue), and into more than one component compound (such as oxygenated hemoglobin, water, and fat), allowing a measure of physiology of the subject to localized to one compartment, thereby reducing the effects of body motion, body position, and sensor movement that can be localized to other physiological compartments or components. In one example, variations in components of the bloodstream over time such as oxyhemoglobin and water are determined based on the detected light, and localized to remove skin surface scattering and reflection, and to minimize changes in the venous bloodstream caused by impact and motion, resulting in an arterial bloodstream signal with an improved signal to noise for the cardiac arterial pulse. The same sensor can provide identifying features of type or status of a tissue target, such as heart rate or variability, respiratory rate, calories ingested or expended, hydration status, or even confirmation that the tissue is alive. Monitoring devices and systems incorporating the improved sensor, and methods for analysis, are also disclosed.

The invention provides a large-area farmland crop water status monitoring method based on unmanned aerial vehicle infrared thermal image acquisition. The method comprises the following steps: 1)arranging auxiliary devices in the field, that is, field air temperature sensors and a ground full-evaporation reference surface; 2) carrying out large-area infrared image acquisition on farmland corps through an infrared thermal imaging system fixed to an unmanned aerial vehicle through a pan-tilt, and synchronously triggering a GPS module to obtain positioning information of the corresponding images; and 3) receiving by a ground data processing system the infrared images and the positioning information, carrying out image registering, splicing and segmentation on the images, extracting spatial distribution of canopy temperature and ground full-evaporation reference surface temperature, calculating the temperature of leaves when the stomas of the crops are fully closed, and finally, calculating water deficit index of the crops and carrying out highlighted display and early warning on the areas, where the water deficit index of the crops is higher than a critical value. Besides, the invention also provides a system suitable for the method. The method and system are suitable for large-area farmland crop water status monitoring, facilitate to realize agriculture precision irrigation and improve agricultural modernization level.

An improved sensor (102) for calorie monitoring in mobile devices, wearables, security, illumination, photography, and other devices and systems uses an optional phosphor-coated broadband white LED (103) to produce broadband light (114), which is then transmitted along with any ambient light to target (125) such as the ear, face, or wrist of a living subject. Some of the scattered light returning from the target to detector (141) is passed through narrowband spectral filter set (155) to produce multiple detector regions, each sensitive to a different narrowband wavelength range, and the detected light is spectrally analyzed to determine a measure of calories, such as calories expended, calories ingested, calorie balance, or rate of calories expended, in part based on a noninvasive measure of respiration, such as respiratory rate, respiratory effort, respiratory depth, or respiratory variability. In one example, variations in concentration in components of the bloodstream over time, such as hemoglobin and water in the arteries, are determined based on the detected light, and the measure of respiration is then determined based on the variations in concentration over time. In the absence of the LED light, ambient light may be sufficient illumination for analysis. The same sensor can provide identifying features of type or status of a tissue target, such as heart rate or heart rate variability, hydration status, sleep state, or even occupancy counting. Calorie monitoring systems incorporating the sensor as well as methods are also disclosed.

An improved sensor (102) for respiratory and metabolic monitoring in mobile devices, wearables, security, illumination, photography, and other devices and systems uses an optional phosphor-coated broadband white LED (103) to produce broadband light (114), which is then transmitted along with any ambient light to a target (125) such as the ear, face, or wrist of a living subject. Some of the scattered light returning from the target to detector (141) is passed through narrowband spectral filter set (155) to produce multiple detector regions, each sensitive to a different waveband wavelength range, and the detected light is spectrally analyzed to determine a measure of respiration of the subject, such as respiratory rate, volume, effort, depth, or respiratory variability. In one example, variations in components of the bloodstream over time such as hemoglobin and water are determined based on the detected light, and said measure of respiration is then determined based on the in components of the bloodstream over time, with venous compartment changes as a result of body movement and body position changes, and skin surface compartment changes as a result of sensor movement, substantially removed. In the absence of the LED light, the ambient light may be sufficient illumination for analysis. The same sensor can provide identifying features of type or status of a tissue target, such as heart rate or variability, hydration status, or even confirmation that the tissue is alive. Respiratory monitoring systems incorporating the sensor, as well as methods, are also disclosed.

An infant hydration monitor includes a hand-held probe equipped with a pair of arms extending from a housing and incorporating a broadband ultrasonic transmitter and receiver. The arms include finger openings allowing the user to adjust the distance between the transducers by manipulating the probe using fingers placed in these openings. Each transducer is mounted on a force meter so that the skin contact pressure is monitored and optionally communicated to the user using a two-color LED. Sliding distance measuring means similar to the digital caliper are incorporated into the housing to allow the probe to generate a signal indicating the distance between the transducers. A display unit optionally worn on a wrist is attached to the probe and is adapted to calculate the hydration status of an infant.

An irrigation modeling framework in precision agriculture utilizes a combination of weather data, crop data, and other agricultural inputs to create customized agronomic models for diagnosing and predicting a moisture state in a field, and a corresponding need for, and timing of, irrigation activities. Specific combinations of various agricultural inputs can be applied, together with weather information to identify or adjust water-related characteristics of crops and soils, to model optimal irrigation activities and provide advisories, recommendations, and scheduling guidance for targeted application of artificial precipitation to address specific moisture conditions in a soil system of a field.

Support structures for positioning sensors on a physiologic tunnel for measuring physical, chemical and biological parameters of the body and to produce an action according to the measured value of the parameters. The support structure includes a sensor fitted on the support structures using a special geometry for acquiring continuous and undisturbed data on the physiology of the body. Signals are transmitted to a remote station by wireless transmission such as by electromagnetic waves, radio waves, infrared, sound and the like or by being reported locally by audio or visual transmission. The physical and chemical parameters include brain function, metabolic function, hydrodynamic function, hydration status, levels of chemical compounds in the blood, and the like. The support structure includes patches, clips, eyeglasses, head mounted gear and the like, containing passive or active sensors positioned at the end of the tunnel with sensing systems positioned on and accessing a physiologic tunnel.

The invention relates to a gas diffusion layer with water retaining property for a fuel cell, a preparation method of the gas diffusion layer, a membrane electrode assembly and application. The gas diffusion layer comprises a carbon paper base and a micro-porous layer, wherein the micro-porous layer is formed by a first hydrophobic layer closely adjacent to the carbon paper base, a hydrophilic layer and a second hydrophobic layer closely adjacent to a catalyst layer by overlaying in sequence, the thickness h2 of the hydrophilic layer is 1.5-2.5 times of the thickness h1 of the first hydrophobic layer, and the thickness h3 of the second hydrophobic layer is 2.5-3.5 times of the thickness h1 of the first hydrophobic layer. The gas diffusion layer can achieve good water retaining property, so as to reduce volatilization amount of liquid water and enable the membrane to be kept in a hydration status under a low-humidity condition; the membrane electrode prepared by the gas diffusion layer can be used for a self-humidifying pile, and is particularly used for the cathode side of an air cooling pile to improve the self-humidifying effect.

Support structures for positioning sensors on a physiologic tunnel for measuring physical, chemical and biological parameters of the body and to produce an action according to the measured value of the parameters. The support structure includes a sensor fitted on the support structures using a special geometry for acquiring continuous and undisturbed data on the physiology of the body. Signals are transmitted to a remote station by wireless transmission such as by electromagnetic waves, radio waves, infrared, sound and the like or by being reported locally by audio or visual transmission. The physical and chemical parameters include brain function, metabolic function, hydrodynamic function, hydration status, levels of chemical compounds in the blood, and the like. The support structure includes patches, clips, eyeglasses, head mounted gear and the like, containing passive or active sensors positioned at the end of the tunnel with sensing systems positioned on and accessing a physiologic tunnel.

Support structures for positioning sensors on a physiologic tunnel for measuring physical, chemical and biological parameters of the body and to produce an action according to the measured value of the parameters. The support structure includes a sensor fitted on the support structures using a special geometry for acquiring continuous and undisturbed data on the physiology of the body. Signals are transmitted to a remote station by wireless transmission such as by electromagnetic waves, radio waves, infrared, sound and the like or by being reported locally by audio or visual transmission. The physical and chemical parameters include brain function, metabolic function, hydrodynamic function, hydration status, levels of chemical compounds in the blood, and the like. The support structure includes patches, clips, eyeglasses, head mounted gear and the like, containing passive or active sensors positioned at the end of the tunnel with sensing systems positioned on and accessing a physiologic tunnel.

Method and apparatus for quantitative and qualitative determination of heart rate, stroke volume, cardiac output, and central fluid volume. Phonocardiography based technique using multiple transducers and multi-sensor processing algorithms provides a non-invasive method of evaluating the output of the heart. This basic system coupled with additional sensor elements provides a wide range of potential capabilities. A system comprising these techniques in a wearable form provides a non-invasive method of determining hydration status and blood volume status. Phonocardiography augmented with multi-sensor signal processing techniques improves signal quality to analyze heart sounds and associated features (e.g. S1 and S2, amongst others). Noise compensation and cancellation techniques for phonocardiography further improve signal to noise ratio to reject external disturbances.

Estimation values of the amount of liquid water inside a fuel cell during operation are sequentially acquired in each predetermined period by means of the following steps (a) to (d), and detection accuracy with respect to the moisture state inside the fuel cell is improved. (a) The previous estimation value is acquired. (b) A water discharge speed which is the amount of liquid water discharged from a fuel cell per unit time is acquired on the basis of the previous estimation value and a value representing the present flow rate of a reaction gas in the fuel cell. (c) The water discharge speed is multiplied by the cycle for which an estimation value is to be acquired, to thereby acquire the amount of liquid water discharged from the fuel cell in a predetermined period. (d) The amount of liquid water discharged from the fuel cell in the predetermined period is used to acquire the present estimation value.